^Right. Their marriage was in 2329, a whole 55 years
after they met. Even for Vulcans, that's a big percentage of a lifetime. By the time they got married, any mentor-pupil relationship was far, far in the past. Also, by that time, Spock was nearly 100 and Saavik would've been in her upper 60s, so the percentage difference in their ages would've become much lower.