A page boy is a young male attendant at a wedding or a cotillion (a social dance).
If the real rings are used, they are generally tacked on with thread to prevent their accidental loss.
Ring bearers are often young relatives or children of friends (usually male but can also be female) and are generally in the same age range as flower girls, which is to say that they are usually no younger than about five nor older than ten, although the age range is up to the marrying couple.
[1] If the couple have had any children prior to marriage (either together or separately), then their child(ren) may serve as ring bearer(s).
The coin bearer is a young boy who marches up the wedding aisle to bring the wedding coins, a tradition in Spanish-speaking countries.