And to re-reference a worthwhile chart via TR info, check out the Men 40-50 chart for men in this post.
Top of bell curve for men
- 40-50 : 2.75 - 3.0 FTP/kg
This is not absolute or conclusive (since it’s only TR rider data), but shows that those at or above 4.0w/kg in the 40-50 range are the outside end of the curve. Worthwhile perspective that is likely more relevant than the Coggan chart, at least for us older riders.