You can be any age when you set up a lab, there are successful ones here that were set up by 25-65 year olds.
I set up my own lab several years ago. Running your own lab is a business, consequently there are a lot of collateral activities required -other than just being a good analyst/lab manager.
1. Create a business plan - most banks/finance companies/regional authority development funds, etc. will have free electronic templates for these. Anybody can ask, and they will help fill it out - everybody, other than your competitors, wants you to succeed..
The plan's marketing and financial spreadsheet determines whether your proposed business is viable - basically because you have to be realistic about potential customers, competitors, startup costs, regulatory approvals. etc.
2. Decide where the money is coming from.
If you are going to mortgage property, you may need to set your other assets up ( eg family home into a trust ) so they aren't exposed if business fails.
3. Understand accounting, or identify a good accountant.
The taxman represents your community's interest, and is fair, but isn't usually benevolent - at least in developed countriss.
4, Unless you purchase an established business, startup costs are very significant.
There's no point in having an HPLC or GC without all the associated paraphernalia - designated laboratory with fume extraction, safe stoarge, sample prep equipment, plasticware, glassware, pH meters, purified water, chemicals, waste disposal, SPE, vacuum, compressed gases.
5. Your national govt, regional authority, and landlord will require compliance with all relevant regulations.
They will have location and insurance requirements for chemical laboratories, especially OSH and environmental rules, and most clients/landlords will require compliance with OSH, public liability, professional liability, property insurance etc.
There are many more, but if item 1 is honest, and looks good, they rest are all manageable with common sense, money, and time.
Please keep having fun,
Bruce Hamilton