How many push up should a 40 year old man be able to do?

Every other day I do 3 sets of 50 - military style (hands below shoulders, elbows in and pointing back , flat back). I rest about 2 minutes between sets.

Every now and then i mix it up (hands closer/further apart, or futher/back of the shoulders)

I am 43 and 6 foot 176 pounds.

I don't know if this is average or not for a guy my age ...just putting it out there