My son is 16 next week his girlfriend is 15 a few weeks after they are lovkey and i love his girlfriend so much she is amazing they have been daiting a while and spend all there time they can together she has slept at our house sevral times and he has slept at hers sevral times but they only once ever slept in the same ved when they slept at her sisters house anyways they are wanting to go to london for a weekend together its 3 hours on a train from where we live do u think they are old enough would u let them ?