@Sweetchocolatecandy
If you want to retire early, you need to start early. When I started work, I was enrolled in the occupational pension scheme, there was no choice. Now that there is choice, you need to start saving ASAP, even if it’s only £10 a month.
When you get a pay rise, increase the amount you save. If you get bonuses, put a bit of it away.
Take financial advice - both reading up places like MoneyExpert, and specific advice for your circumstances. You need to keep an eye on your investments, not just leave it and forget about it.
It should go without saying - don’t build up debts on credit cards etc - they are fine to use to manage cash flow, but try to pay off every month.
Two other things. You need balance - life would be pretty miserable if you never had a treat or did things you enjoyed. I would say we have been sensible, but not frugal.
The other thing is that many people will not be able to do what we’ve done because their circumstances make it all but impossible. We had no student loans - our education was paid for. As a new graduate, I could buy a house on 100% mortgage for twice my salary. And no kids.