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Good question. During the movie:

-Paige was just entering University, so she was prolly about 19. But since her birthday in S2 was mid-May, she musta bin days away from being 20.

-Tanya had returned from 4 years of modelling in Europe. In S2, 1 of her modelling girls was 17 when she left to model in NY. If the 1st year is in Canada & US, then 17 + 5 =22. Jason and Danny are roughly the same age as Tanya so all 3 were 22.

-Erin had been lifeguarding at Falcon Beach for at least 3 years before. 16 is the minimum lifeguard age making her at least 19, so say she was 20.

-Lane's older than Paige and was supposed to be a few years into University. Let's say 2, making him 22.

After movie (S1):

-Paige is 20

-Adrian had finished his residency, making him about 24 or 25. Since he didn't seem too much older than Paige, let's go with 24. And if he skipped a grade in elementary (he's smart you know) make him 23.

-Very little info about Hurst. Without any sterotypical time-boundaries (school, parents) we don't know so just make him Lane's age=22.

-Adrian's wife didn't look that much older than Paige, yet he met her in University, so just say she's 22.

-Sarah Chan must have at least 1 University degree, yet looked young. Her position must mean years of experience so presuming she started interning at the Bradshaw group while she was in University, say 21 + 5 years  = 26.

S2: 

-Taking Jason, Tanya, Danny, & Lane as now being 23, say Courtney is about that old. She's independant enough to not need her parents, but they're rich and spoiled so she's still 'with' them. She certainly had few responsibilities so make her closer to Paige's age, so Courtney = 22.

-Nathan was no rookie lawyer, Trevor had much confidence in him. Make him 25.