What to do with 80k at 62

[TreasuredMim]

Unmarried; adult DC; mortgage paid; two defined contribution pensions (one in payment); working and will continue to do so hopefully for at least 7 years; have emergency fund and 20k savings. No expensive habits or desires.

Essentially want to store money for at least 5 years until such time I gift to DC when he's mature enough to not blow it.

I would invest it in an S&P 500 fund. Keep it locked away for as long as necessary.

With a 5 year window, I wouldn't invest it all in equities, but split it, so some was in equities and some in cash and some in bonds. Exact splits would depend on exactly what DC planned to do with the money. If it was for a property purchase, then maybe dripfeed each year for the next 5 years in to a LISA, which would use up £20k, increased to £25k by the government top up. Maybe in a diversified fund, to reduce risk. The rest i would put in to cash; some in instant access, some in 1 year fixed rate, some in a 2 year fixed rate, and then as and when the fixed rate ones mature, invest them again in something similar, so creating a 'ladder'.

If it was me I would invest in ethical funds supporting renewable energy.