Are we too old??

We hear quite often from folks, "we are too old for that". So, when a couple in their mid 70's embarks on a trip of almost 6000 miles from New York to Hoover Dam, are we too old? 
The goal was to visit many of the great national parks is the west. Here is a summary.

Mileage traveled – 5,789 miles

Number of days traveled - 35

States visited - 17

National Parks, Monuments visited - 11

Other museums Visited: 5

Highest Altitude climbed in motor home –

Eisenhower Tunnel under Continental Divide - 11,153 ft

Highest Altitude climbed by commercial means –

Jackson Hole, WY tram: 10,415 ft – (14,400 ft view of Grand Teton)

Photos taken – about 1000

Rallies attended: 1 International in Gillette, WY

Just about the time I think about patting myself on the back, I remember 2 octogenarions joined us for the first 2+ weeks. 

None of us are "too old". Just need a little motivation.