Indeed difficult to answer and despite getting good financial consultations provided by my employer Goodyear Tyres I was still nervous stepping into the employment free world !!!
Assuming everything paid off (houses,kids university fees,toys etc) I have more than enough on 50% of final salary.
I am lucky enough to have a good company pension plan and could exist easily on that amount...when the Government Pension came in at 65 I considered myself "well off" to the point where although being a Yorkshireman and hate wasting money I can buy what I want without checking the price,
In conclusion as a Baby Boomer I consider myself very lucky !!
You may be surprised how little you need to have a good life without wanting for anything.
Step out and enjoy life !!!