I applied for voluntary redundancy at 53, I'd spent my whole career working for the firm, so got a decent lump sum.
My occupational pension didn't kick in until my 60th birthday, and I'm having to wait until I turn 66 to get my state pension (robbing ba****ds), so I economised a bit, but as I was home all the time, saved money naturally by cooking from scratch, not buying 'office' clothes, no travel expenses etc.
DH retired at the age of 55, fifteen months after I finished, with a lump sum and his occupational pension.
We love every moment of being retired, I can't think of one negative aspect!
If we'd both still been working, we'd have seen our DGS at weekends, but as it is, we look after him for three full days per week, and enjoy every second!
If you know you can manage financially, go for it, my DF died at the age of sixty one, never having retired, life's short, enjoy it while you can!