woodway

+1 on this.

I'm 60 and still do big backcountry rides in the mountains of the Pacific Northwest. The big differences from riding these trails in my 30's to today:
1. The equipment is so much better. Today I am riding a 6" travel full-suspension, slack head angle bike that just soaks up the tech on the trail.
2. When in doubt, I am wise enough now to hop off and walk the really sketchy stuff.

I love mountain biking and hope I can keep it up for the rest of my life.

obrentharris 

3 years shy of 70 myself.
This was my first mountain bike, built for me by a friend when I was in my mid thirties:




I've been riding regularly ever since.
A year ago the arthritis at the base of my thumbs got so bad I couldn't ride anymore, but I noticed that I had no trouble on my road bikes with drop bars, so I put the biggest tires I could on my sturdiest road bike and took it out on the trails to see how I did. Thumb pain gone!
So my old friend built me another bike, this one designed specifically for drop bars:




I don't get the "big air" like some of the kids, but I'm not yet ready to say goodbye to the rocks, roots, fast descents, and big climbs.
Brent

reconnaissance

60 years old this year. Been riding MTB’s since 1985. Lots of fun and agreeable change of pace from my road bike. I haven’t yet learned not to fall over but I did give up toeclips on the MTB and it has helped some.

My bike is a steel Trek 850 with no suspension. But I have ridden my son’s full suspension fat tired beast and found it to be much more nimble and stable on the trails we ride.

curbtender

I still ride with bottles, gives a good taste of your surroundings, lol.

Mountain Mitch

Now that is a well used gravel grinder!