Think very, very carefully about what your CV will look like at the start of the up-turn.
Whilst it is 'illegal' to mandate employment based upon age I think I would be looking at sub 30 year old newbies with minimum experience before upping the age bracket to include those with less working time available to the company but with the same experience levels.
That is not said to be provocative but it is a realistic view of recruiting policies. You need to look at how you will make yourself 'stand out' from all of those who have trodden the same path but have 10-15 years on you.
Plus the money issue will be huge and take a looong time to cover.
BALPA are starting to take a look at the age/experience/pay to fly issue soon as are the FAA. Depending upon their discussions and findings there could be change in the future. That is supposition but adds to the risk of the financial gamble.
Good luck.