You may consider it late to buy bitcoin today if you compared its price last month or last year when it retraced to abiut $6,700 or below $5,000 last year.What you keep in mind is bigger profit you can get if buying last year or last month.But it is not fully right, because price may keep rising today, that means you still can buy now and it is not late. Lowest price or highest price are applicable only for certain time period.