Give as much as importance to your goal as you give it to your first girlfriend with that much importance your girlfriend might still leave you but your goal will definitely come to you.
Your youth is certainly finished and old age has definitely arrived if you feel that you are losing enthusiasm excitement and energy towards your dreams and goals.
Think about your dreams. Think of every detail of what you want to manifest. Imagine every person included in your plans. Sense all the emotions that you want to happen when your dreams come true. Visualize where will you be when your dreams already happened. Breathe the air where you want to manifest it. Dream. Imagine. Believe. Theres no more truer than this. It is what it is.