It depends on the type of offering.
WWF Funding Portal, LLC offers investment opportunities under Title III, Regulation Crowdfunding. Any U.S. citizen 18 years or older is eligible to invest under Reg CF, however there are limits on how much an individual can invest based on annual income, net worth and investments on other crowdfunding portals within the past year.
WWF Crowd, LLC offers investments under Regulation D, Rule 506(c) of the Securities Exchange Act and which are available to accredited investors only.
Each company may have different limitations on who can invest in their offerings. More information can be found on the offering pages and disclosure statements of the offering companies.