Someone (will remain nameless if they wish) sent me a note asking for my feedback on age discrimination. I ended up responding in kind, and decided the response was worth posting for everyone to read.
Warning: If you're a "baby boomer" you might find this note a bit crass. Yes I am stereotyping, no I don't care, yes you can complain, no I won't listen. 
At any rate here we go, feel free to post your experience as well as I'm sure this individual could benefit from others. If you're open to it, please post your age at the beginning of your post so the rest of us have some context.

Hey man,
I've chatted with you a few times on some threads on here and realized we're both in similar situations: young, successful and married no kids.
Since we're around the same age I was curious if you've ever run across something that I run into. Age discrimination. Since you are in management I was curious if you ever have problems gaining the respect of those you manage because of your age? I'm sure you have a variety of people ranging from young to older... If you have dealt with it, what did you do?
Also, sorry to force you to think about this while you are in the middle of a dilemma. Congrats on the new job offer btw, and good luck on your decision! I was going to post something in the thread but everyone pretty much said it all... It all comes down to what your priorities are from now and going forward. I hope it works out for you either way you decide.
Hey Bud,
Thanks for reaching out. I'm happy to answer a few questions and perhaps put your mind at ease. Then again... I could just make it worse.

I'll start with a bit of a profile so you can get some context and apply this info to yourself as needed.
I am a 26 year old male who has been married for 6 years, together for 9 years. I graduated from high school in 2004, got my associate's in CIS in 2006, and by bachelor's in CIS in early 2007. Following that, I moved to where I am now and pursued a double master's degree for IS management and business administration. Following those two degrees, I am finalizing my education with a PhD in CIS Security and CIS Management. From a professional perspective, I took my first sys admin job in 2005. I was working part time at a photo restoration company making $11.50 an hour to administer a very small network. After a year of working there, I moved to a region based consulting firm that focused on managed services provision. I started there at 16 an hour, and progressed as my education did over the next 5 years to an end point of 50K per year. I left that org in October of 2011 for where I am now. The move was a no-brainer as they were doubling my salary, giving me a larger team with more learning opportunities, and tuition reimbursement. And finally, as you're aware I am now considering a move to a Fortune 10 company for what has turned into a 40% wage increase and hefty retirement options (That's right, I'm 26 and talking about retirement... you should be too). On the certification front, I never put much weight into it until recently, subsequently ending up here. I passed a small time Microsoft cert back in 2009, but didn't do anything else until this past December of 2012. I sat the CISM exam, and am obviously still awaiting results (I think I killed it though). Presently, I'm studying to sit the CISSP exam. We'll see where that goes, but the exam is bought and paid for and is set to write in two months on March 30th. There you have it, a not-so-short run down of my academic and professional career. Take it for what it's worth, and apply the following advice where you may. YMMV
Referencing you're specific point above: Age discrimination is something that all young professionals have to deal with. The baby boomer age is very "old-school" insofar as if you haven't spent 30 years in the industry, you've no idea what you're on about. Never mind the fact that you've spent the better part of the last decade with your face in a book studying the theories on which these geezers have built their IT reliance upon. Granted, there's something to be said about real world experience versus theory, but it doesn't excuse the complete lack of open-mindedness that I've seen within not only our industry, but many other "evolving" industries. I think it may center around their discomfort of the fact that the world is changing so fast that they can't keep up, and all that stuff they've been dealing with for 30 years is largely irrelevant in today's market. Call it what you will, I call it jealousy. *shrug*
At any rate... My particular experience with age discrimination has been fairly light, and is more of an annoyance than a real problem. In my last job, I was making half what I was worth simply because I had worked at that job since before my first college degree was done. So... of course the company was still paying me like I was in college. Jumping ship to a new company was the only way to get what I was worth. As I stepped into this new role, there was a bit of a culture shock for me... Going from a SMB to an enterprise org. I manage a team of over a dozen people in my current role. Each and every one of them is older than myself. Some of them only by a few years, but most of them are old enough to be my dad. When I first started this role, I was very keen to NOT mention my real age. Call it the stress of 90 hour weeks at the previous job, plus another 40 hours a week at a second job to make ends meet for the family, but I certainly don't look 26. I easily pass for my mid-30s, and if I told someone I was 40, they'd probably believe me and ask what kind of night cream I use. Working with this team for over a year now, I have come to EARN their respect. I wouldn't say I fought much, if any, in the way of age discrimination here, but I'm sure it may have been present without my realizing it. I'm sure my credentials and ability to manage a team responsibly spoke for itself. My current boss certainly treats me with a degree of childishness, but that may very well be his being intimidated by my success at such a young age (I'm truly qualified to do his job should they put him behind the 8-ball).
Now... age discrimination in the field is something to think about as well. I'm not sure what kind of role you have in your organization, but on more than one occasion, my previous employer would refuse to take me on their sales calls. Once they had sealed the contract with signatures, I was in turn allowed to meet the client. This was specifically due to my age. The president of the company was afraid that if the clients saw some hot-shot 20 year old about to stick his hands in their $500,000 network gear, they'd have a bit of a freak out moment and retire the contract. This separation was indeed enforced by my own manager, but not because she thought that I wasn't qualified. She knew very well what my abilities were, and that I was one of the most useful engineers she had. Again, this involved some time of me PROVING to the company that I know my stuff. She knew what I was worth, but feared that clients (those damn baby boomers) wouldn't be quite so understanding. If that isn't age discrimination, I don't know what is.
Working with age discrimination is easy enough I suppose. Verbal articulation is one of the best things you can do to help with that. Presenting yourself as a distinguished and polished professional in BOTH the spoken and written context is key. There are many individuals that I worked with over email for years who had no idea that I was a 23 year old college grad just getting started in the industry. Why? Because I talked the talk just like those god-forsaken baby boomers.
You asked the specific question of "
I was curious if you ever have problems gaining the respect of those you manage because of your age?"... I have never had a problem gaining their respect over time. However, don't mistake this answer for thinking I didn't have a harder time of it because of my age. There are VP jobs out there that I am qualified for that I don't get because of political reasons (Political is a euphemism for age discrimination . However, I live a very comfortable life with my current opportunities, and I simply need to be patient. Not everything is in a title.
TL;DR: Earning respect at a young age is hard. Keep your nose to the grind stone, and present yourself professionally, and before you know it you're just another successful business associate. Be prepared to lather-rinse-repeat if you change organizations or professional settings.
Hope this helps.
C