I used to ride a lot about 10 years ago, 80-100 miles/week and after a while lost my motivation so I gave it up. Recently we bought my wife a bike and that rekindled my interest. I now ride my road bike (a 1992 Bianchi Virata) 4-5 days a week about 15 miles per ride.
I'm of course slower than back then as well as 20 pounds heavier even though I've already lost 15 pounds.
I've discovered the following since my cycling rebirth:
1) I use a lot more gears than in the past
2) I need larger (more teeth) gears to climb
3) I'm 2-2 1/2 mph slower than in my 30's (I avg about 15.5 mph now)
4) I still love my steel frame and love to buy new toys for the bike.
Any advice or similar experiences would be appreciated.