Hi Dogman
12 months ago I was in an almost identical situation to 'your friend'. I earned circa $140k per year and I gave it all up to pursue a flying career. I am now 35.
I have recently passed my Commercial Pilots Licence and am now working towards my night and instrument ratings.
Many of my friends think I am mad - I probably am, but they do not feel the passion I have inside for flying and the challenge it presents. I suspect 'your friend' feels the same.
The best advice I can give to 'your friend' is to consider the changes that a change of career brings and the numerous sacrifices it brings and search within themselves to find out whether they have the committment to succeed regardless - believe me there are many sacrifices to be made.
I train at Adelaide Flight Training Centre who I can recommend!!!