Yes, I'm early 60s and have 6 different friends who are in their 90s, and plenty more who are in their 80s.
I have friends of all ages. Obviously, the people in their 20s and 30s I am friends with, I haven't know as long / have the same amount of history with, simply because I've not known them as long.
This last Summer I've been to celebrations for 3x 30th, 1 wedding, 2 x 90th, 1 Ruby wedding (40 yrs) and 2 Golden Weddings (50 yrs), 1 engagement, 1 80th, and 1 18th birthday, and 1 Christening of a baby. I've just found another couple I'm friendly with have recently celebrated their 60th wedding, although they didn't have a party.
My dearest friend is 10 years older than me, and the friend I spend most time with, most regularly at the moment is 20 years older than me. A couple I see pretty often (because of something we do together about twice a month) are 30 years younger than me.