As you near retirement age you'll want to slide it towards a more conservative mix; you don't want a 50% stock market crash to add a decade to your career.

I’m not an expert so someone correct any of this that is wrong, but there are broadly speaking two types of funds:

Accumulation and Distribution

Accumulation funds will do the reinvesting internally, so they really are set-it-and-forget-it vehicles.

(Distribution units hold the dividend returns as cash, i dont use these, I’m not really sure why anyone would but I assume there’s a tax reason somewhere).