Probably the greatest paradox inherent in our political system over the last decade or so is that while the Democrats are the party that protects elderly voters from reductions in entitlement programs, those same voters overwhelming support the GOP.
There is a truism to the effect that any condition that is unsustainable ultimately will not endure. It applies here. Either the Democrats will at some point turn their backs on the elderly, the Trump Generation will simply die off, or the GOP will get its chance to cut entitlements and will pay the price for it. Since the Democrats are the party of government and the welfare state, the first possibility is the least likely.