It always depends on the test method - you can weigh yourself - I weigh 60.5kg but then it is all about the FTP calculation. I have a ramp test recently which gave me 298W - so close ish - and I think I could maybe do a bit better now I have nearly finished SPB - BUT I think the Ramp over estimates my hour power as the most I have ever got out in a 25mile tt is 261W - but then that is on my Exocet 3 tt bike where as my ramp is on my road bike. So who knows - although I am doing a road bike tt next Saturday so that could be revealing (21 hilly miles). So I guess we can measure it different ways - still I’m over 4W/kg and closer to 5 at the age of 51 with only 2 years of just cycling after doing tri/marathon running so I’m happy ….I was 58kg though last year for a month but that was just after the flu so it probably doesn’t count! 
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