You need to start tracking your income and spending now OP if you don't already.
We're not completely retired but the part time income we do have goes on holidays and fun stuff. When the state pension kicks in, that will make up for our PT incomes.
You don't want to be miserable in retirement and we find we need to be out more now the social contact from work has gone. We don't miss the stress that used to go with it though!
We spend less on:
Housing (mortgage is paid off).
Kids - although we do help them out a bit as their housing costs are high and have student loans to pay off
Clothes - I sometimes buy from (and donate to) charity shops and have time to look for bargains although don't buy as much anyway. DH never used to spend much.
Food - rising costs have pushed this up of course, but time makes a big difference, we cook from scratch, use the freezer and don't throw as much away. As you get older, you don't need to eat so much either!
Fuel - free bus pass and concessions mean we don't drive quite as much, although DH no longer has a company car with free fuel.
Eating out - we budget for this so that money goes on holidays instead.
We spend more on:
Travel - we're having some big holidays before we're too old and taking more short breaks.
House renovations - more time at home means we notice stuff needs doing.
Heating - because prices have risen and we're home in the day.
Sporting activities - golf, health club - more time to do these.
Everyone will be different!
Start planning now - there's a good podcast I listen to call the Retirement Answers Man - he's based in the US but still has useful information about the financial and psychological aspects of this stage of life.