Can you maintain an erection for 10/15 minutes?

Yes I have No Problems...YET! lol At 60 yrs old I am blessed to still be abled to quickly get a good HARD erection and keep it easily for 15 minutes. I say I am blessed because I have friends who have been having troubles with this for years and have to "medicate" to get a good erection. But it really helps them. So I guess I am fortunate I can still quickly get hard when aroused and maintain a good erection.