We did by both working two jobs for most of our lives. DH a full time Joiner and part-time drummer : Me a full time WA worker and part-time accounts for DH's business. My 'hobby' organic fruit and veg growing, also contributed to the family finances and working flat out meant little time for holidays so a big saving there. We used to scoff at people who spent there hard earned cash going to the gym, playing golf, attending Dinner dances, while our hobbies which we enjoyed, earned, rather than cost, money. This enabled us to supply the deposits for Student flats for both our DDs and they, in turn always had part-time jobs while at uni + flatmates whose rent paid for the mortgages. Flats sold when they graduated, giving them both a big start on the housing ladder.
No work pensions for us, so, on retirement we bought a flat, renovated it and let it for many years, then sold it at a profit, leaving us with a tidy sum invested in stocks and shares. BUT, The best laid schemes of mice and men gang aft agley - DH developed Dementia, had to give up driving, drumming, DIY and our nest egg is now being drained away by £4000 a month for Care Home Fees.
All this to say that a) One way to increase income is to develop a hobby or talent into a part-time job, and b) no amount of forward planning will protect you from the vagaries of fate.