Absolutely Not. 70 is the new 30 except w/ pain and little short term memory. My elderly wife and I hiked just over 7 miles today in the Egan Range of central Nv. w/ gain/loss of more than 4000' feet of vertical. We just returned to our motel and are easing the pain w/ gin prior to heading out later for Mexican food.
Life is good if you don't weaken.....and are very, very fortunate.
mike r