I've seen much the same excuse chain from other, mostly middle aged ,men. In that my knees/ back or what ever won't support this exercise. Which is reasonable logic, apart from the fact that starting at a low weight and building up would much improve the strength and therefore the health of your knees.
you may or may not get to a certain level, but in trying you would a) have greater lower body strengh than you do now and b) knees in a much more functional state
10 mins every other day, though not optimal, is sufficient to complete a full body work out over a week and make strengh gains, if you go for compound exercises