Occasionally I, as an accredited investor, will be invited into a "private placement." I've always declined and never regretted it. The oil/gas ones are almost 100% scams.
Many of my best stocks are more than a century old, firms such as UPS, MMM and Boeing. Carrier dates to 1902. My Berkshire Hathaway has roots going back to 1839! Rockwell International, an enormous winner and div payer, goes back to the 1930s, with many spinoffs.
GL