(as) tough as old boots

US /əz tʌf əz oʊld buːts/
UK /əz tʌf əz oʊld buːts/
"(as) tough as old boots" picture
1.

duro como una roca, resistente

very strong and able to deal with difficult situations

:
My grandmother is 90 years old and still (as) tough as old boots.
Mi abuela tiene 90 años y todavía está (tan) dura como una roca.
You need to be (as) tough as old boots to survive in this industry.
Necesitas ser (tan) duro como una roca para sobrevivir en esta industria.