Oh I agree so much here. Full black/dark brown hair in middle age might give like a "coffin look." Reminds me of the makeover service given to old dead people, when it's OTT! It's because you immediately notice something isn't right because you see the skin and hair colour don't match up in terms of youthfulness. Looks embarrassing and desperate.
Women can get away with it as it's more normal to keep dying it, even then they would have to work with lighter colours,as a minimum light brown.
http://www.dailymail.co.uk/tvshowbi...mp-debuts-new-silver-fox-hairdo-Lorraine.html
Martin Kemp went from full dyed brown hair to all white, within a short time frame. He can probably still pull off both but he looks much better with the white imo. Ideally a a dye which allows some greys to remain would have been best - and they do exist.