There are 3 situation opportunitys to make a citizens arrest, my dad told me them (RCMP Constable)
-This is an arrest without a warrant by any person other than a peace officer.
Immediately following such an arrest the suspect must be turned over to a peace officer.
A citizen’s arrest can be made under these circumstances…….
A person whom he finds committing an indictable offence.
A person who on reasonable grounds he believes has committed a criminal offence or is escaping from and freshly pursued by persons who have lawful authority to arrest that person.
An owner of property or a person authorized by the owner, can arrest a person whom he finds committing a criminal offence on or in relation to that property.
There is no Age limit, but you better be ready for a struggle, because no one wants to go to jail.