I was feeling old partly because of the number and partly because of the terrible shape I was in...no doubt...60 pounds overweight, out of shape, and grouchy because of it! Not pretty.
Before my 58th bday last year, I had almost resigned myself to dying of a heart attack within the next few years. My feet hurt like hell, because I had had plantar fasciitis for 18 months. I was huffing and puffing up one flight of stairs.
So I know how you felt!
For months, I literally dragged myself into the gym. Slowly, gradually, my antipathy for exercise turned into anticipation for it. Now, after 10 months, I can keep up with people who are 30 years younger than me.
Day by day -- that's the key. We'll get there!