As a t-shirt designer there are 3 ways to get a vintage cracked ink look for your graphics like this:

1. Print a t-shirt. Repeatedly wash & wear the shirt for 10 years.
2. Use a crackle ink to print your design. It's good to give it a wash before selling so that the cracks will become more visible.
3. Use the "Plastisol" collection of Photoshop Brushes and Bitmap Textures to add a consistent & reliable vintage look to your designs.

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You might enjoy the Plastisol Textures Collection because 10 years is a long time to wait for t-shirt ink.