'Plein de vieux ...' means 'full of old ...'. Les vieux is also used to designate the elderly, but this could be disrespectful.
"Full of" in French is translated as "plein de" or "rempli de."
''The lady full of wisdom''
Plein, pleine means 'full' in English. Le verre est plein, la bouteille est pleine (the glass is full, the bottle is full). That can also mean 'lots / loads of'. Il y a plein de monde (there are lots of people).
'plein de fois'
plein(e) de courage
plein de rires
'plein de ressource(s)'
full of is plein de ... / pleine de ... in French. Ex: la rue est pleine de monde (the street is full of people) le restaurant est plein de touristes (the restaurant is full of tourists)
de vieux amis
Outdoor is "extérieur" or "de plein air" in French.
Musée de plein air
Manquer de vieux êtres.