I would have to say that my sexlife has gotten better as I have gotten older. Whether it be maturity, experience, having the right person as your lover or partner, I think all of those things can add to your enjoyment. I will be 40 this year, my sex drive has not waned nor has my personal lubrication, if anything it is higher than I seem to remember
On a positive note, for me it has been encouraging that my drive hasn't waned due to medication which I know can happen to some.