For older people, who have experience building stuff,e.g-software developers who have done some development in their life- they are worth their weight in gold. BUT most older people I work or have worked with, they are not all developers. People like sysadmins,IT people, sharepoint admins, automation managers,DBAs,Managers some system architects etc- I have seen some common traits- 1) They have no enthusiasm for work. Work is not even secondary for them. Its the last thing
2) They either think they are doing hard work or act like they work hard. Exaggerate all issues or whatever work they did even if its just an installation
3) No passion for technology 4) Do not want to learn anything new 5) Don't care about above, because its time for their retirement and so they don't care what others think
Given this, if I were building a team, I would lean towards the younger crowd. Unless the older person has experience building stuff.