Well to answer it simply, no, spikes are absolutely not appropriate for older men. Infact older men should never opt for this look. It is a youthful style statement for guys in college and mid-twenties at the most however there is an exception to this rule. If older men wish to go for spikes there is a look especially for them which is charming and attractive.
This look is that of the spikes with fade. In this case the length of the hair is short, back is trimmed even shorter and the sides are a fade. If your professional life will allow you to pull off such a look then you can most definitely opt for this gorgeous style statement. It is sexy, mature and charming. The look requires good amount of timing, efforts, skill, maintenance as well as it is mildly expensive because of the use of hair products to maintain the style all day long but is surely worth all of it. This look is cool and trendy and will set your office life on fast gear! but make sure your office life does allow you to splurge on such fashion choice before you go in and invest into the look!