Why does an 18/21 yr old need £100,000?!! What about working for your money?
I would suggest you remove that snotty tone.
My father has worked all his life to provide 6 figure trust funds for myself and sisters which we get access too at 25. Has it stopped me working? No, I have a great degree and an incredibly well paid profession career. I appreciate my job more and now I am well on my way to providing exactly the same for my daughter. And I'll only be providing for her therefore hoping to give her access to 7 figures.
It's starting her well in life so she doesn't have any worries. Do I expect her to work absolutely. And as owner of the trust, it would be revoked or delayed until age 30/35 if still not deemed appropriate.
I personally couldn't wave my daughter off without giving her help, just how my family is raised to make sure we all have everything we need and want. You might not understand if not being in the position but that doesn't make it a subject to be frowned upon.