They sure can.
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A young adult is in there early 20's where as an adult is in there 30'. A young adult can marry an adult.
No. Your sims need to be one of the following: Young Adult - Any Tattoo Adult - Any Tattoo Elder - (Unknown)
Yes, your sims have a life span which you can change the length of in options. They have different stages of life for a certain amount of time: baby toddler child teen young adult adult elder
Since Young Adult Sims can't get married at all, your Greek Sims can't get married either. Sims can't get married until they become Adults.
Yes