^^Well as posted above "...age is not a protected ground and can be used to identify ideal tenants."
Everyone has opinions, but fundamentally you have to look at the law:
In
Alberta age is not a protected ground and can be used to identify ideal tenants. However, landlords are prohibited from discriminating against tenants based on: race, colour, ancestry, place of origin, religious beliefs, gender (including pregnancy, sexual harassment, and gender identity), physical disability, mental disability, marital status, family status, source of income, sexual orientation.