Column formatting & dates

R_o_n_ Try using JSON like: 

{
  "$schema": "https://developer.microsoft.com/json-schemas/sp/v2/column-formatting.schema.json",
  "elmType": "div",
  "txtContent": "=toLocaleDateString(Date((getMonth([$DateOfBirth])+1) + '/' + getDate([$DateOfBirth]) + '/' + getYear(@now))) + ' | ' + toLocaleDateString(@now)",
  "style": {
    "color": "=if(Date((getMonth([$DateOfBirth])+1) + '/' + getDate([$DateOfBirth]) + '/' + getYear(@now)) < @now, 'red', 'green')"
  }
}

Output: 

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