This audience just demonstrated what I hope I can do in my 50s, still hungry and active expanding their property portfolio.   

My principal is to always use 'other people's money'. In order to buy a new property, I will raise capital by speaking to a mortgage consultant in order to explore to potential of refinancing the existing properties on hand. The key would be to have the properties breakeven between installment and rental amount.   In our 50s, the obstacle would be the loan tenure provided by the bank. It will be very short resulting in a high monthly installment amount. Hence heavy cash outlay may be the solution to afford new properties.   

I would also encourage this audience to explore sub-sale properties as they provide higher certainties. Use the upfront capital as an advantage, invest in properties that is already making money. People are not buying them because they cannot afford the high capital outlay.