There's a reciprocal obligation. The young need to respect the claims made on them to some degree because they in turn will want to make claims on the future young when they are old. If they did their bit, they are more likely to find that reciprocated.

IMO part of the problem we have in UK society right now is that the compact of mutual obligations has been broken (at leat in perception), specifically by the old towards the young. Most clearly with the generational divide over Brexit, but also a general sense of contempt - a problem to be solved.

The old have duties to the young too. The claims are not absolute. If labour becomes scarce, or working conditions harsh, housing short, the burden of fulfilling them [producing the food, heating, housing, entertainment, care] is greater.