Is that just because there's shareholder anxiety with the unknown on if their investment will "be vested" by the time they need to pull it out for retirement?

Is that just because there's shareholder anxiety with the unknown on if their investment will "be vested" by the time they need to pull it out for retirement? If that's the case it seems like it might be shrewd for younger investors to buy into physics research on a 15-20 year timeline?